/*
 * Copyright 2011 woozzu
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.nd.android.musicboxlibrary.ui.view;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.ListAdapter;
import android.widget.ListView;

/**
 * 
 * <br>
 * Created 2014年7月17日 上午1:24:29
 * 
 * @version
 * @author wat.ztag
 * 
 * @see
 */
public class IndexableListView extends ListView {

    private boolean mIsFastScrollEnabled = false;
    private IndexScroller mScroller = null;
    private GestureDetector mGestureDetector = null;

    /**
     * Creates a new instance of IndexableListView. <br>
     * Created 2014年9月15日 下午11:03:14
     * 
     * @param context Context
     */
    public IndexableListView(Context context) {
        super(context);
    }

    /**
     * Creates a new instance of IndexableListView. <br>
     * Created 2014年9月15日 下午11:02:48
     * 
     * @param context Context
     * @param attrs AttributeSet
     */
    public IndexableListView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    /**
     * Creates a new instance of IndexableListView. <br>
     * Created 2014年9月15日 下午11:03:10
     * 
     * @param context Context
     * @param attrs AttributeSet
     * @param defStyle int
     */
    public IndexableListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean isFastScrollEnabled() {
        return mIsFastScrollEnabled;
    }

    @Override
    public void setFastScrollEnabled(boolean enabled) {
        mIsFastScrollEnabled = enabled;
        if (mIsFastScrollEnabled) {
            if (mScroller == null) {
                mScroller = new IndexScroller(getContext(), this);
            }
        } else {
            if (mScroller != null) {
                mScroller.hide();
                mScroller = null;
            }
        }
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);

        // Overlay index bar
        if (mScroller != null) {
            mScroller.draw(canvas);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        // Intercept ListView's touch event
        if (mScroller != null && mScroller.onTouchEvent(ev)) {
            return true;
        }
        if (mGestureDetector == null) {
            mGestureDetector = new GestureDetector(getContext(),
                    new GestureDetector.SimpleOnGestureListener() {

                        @Override
                        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                                float velocityY) {
                            // If fling happens, index bar shows
                            mScroller.show();
                            return super.onFling(e1, e2, velocityX, velocityY);
                        }

                    });
        }
        mGestureDetector.onTouchEvent(ev);

        return super.onTouchEvent(ev);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return false;
    }

    @Override
    public void setAdapter(ListAdapter adapter) {
        super.setAdapter(adapter);
        if (mScroller != null) {
            mScroller.setAdapter(adapter);
        }
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        if (mScroller != null) {
            mScroller.onSizeChanged(w, h, oldw, oldh);
        }
    }

}
